blupdf vs Sejda
Sejda is a well-known web and desktop PDF editor with a generous free tier and per-task tools. blupdf is a browser-based AI editor focused on retyping text in the original font — on digital PDFs and, after OCR, on scans. The biggest practical difference is scanned documents: Sejda states that editing them is not supported, while blupdf treats them like any other page.
Try blupdf freeSide by side
| Feature | blupdf | Sejda |
|---|---|---|
| Runs in the browser, no install | Yes | Web editor + Sejda Desktop |
| Edit existing text in the original font on digital PDFs | Yes | Yes — click any existing text to edit |
| Edit scanned PDFs after OCR | Yes | Not supported: changing existing text within scanned documents is not supported |
| AI font matching when a font is missing | Yes | Prompts to choose a replacement when the original font lacks characters |
| Ask questions about the document | Yes | No |
| Find & replace across pages | AI-assisted, one run with review | Not documented on the editor page |
| Pricing model | Credits: 1,000 free, then from $39/month | Per user: Web week pass $5, Web monthly $7.50, Desktop+Web annual $63 |
| Free tier | 1,000 credits, no card required | Free for documents up to 200 pages or 50 MB and 3 tasks per hour |
Verdict
Choose Sejda for cheap, occasional edits on digital PDFs: the free tier is generous, a week pass costs $5, and the editor does let you change existing text. Choose blupdf when scans are involved, when the font matters, or when you want AI help — OCR on upload, font matching for missing glyphs, document questions and find & replace are part of the same editor, priced by credits rather than per user.
Frequently asked questions
Can Sejda edit a scanned PDF?
Sejda's editor page states that editing scanned documents is not supported and that changing existing text within scanned documents is not supported. blupdf runs OCR on scanned pages and lets you retype them in a matched font.
Is Sejda free?
Sejda offers a free service for documents up to 200 pages or 50 MB with 3 tasks per hour, plus paid passes and subscriptions. blupdf gives every account 1,000 free credits with no card.
Which keeps fonts better?
Both reuse embedded fonts. When characters are missing, Sejda asks you to choose a replacement; blupdf picks the closest match automatically and lets you override it. On scans, only blupdf renders edits in a matched font.
Comparison verified on 2026-08-27. Sources: www.sejda.com, www.sejda.com. Sejda is a trademark of its owner; blupdf is not affiliated.